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ROM 4X and 5X
ROM 4X and 5X are enhanced firmwares for the Apple //c and Apple IIc Plus.
Main features:
Initializes memory expansion card without erasing it if it already contains a boot sector. This is intended for battery-backed memory expansions made by
A2Heaven.
Boot menu via CTRL+CLOSED-APPLE+RESET or CTRL+OPTION+RESET.
Allows dropping into the monitor immediately.
Allows clearing memory expansion card.
Allows launching diagnostics.
Allows selecting boot device.
4X: With battery-backed RAMdisk, can configure default boot option.
5X: Replaces accelerator firmware.
In development:
See ROM 4X and 5X on GitHub.
Releases
GitHub
Binary Distributions
I'm not guaranteeing these are up-to-date with the master branch, but they are mostly stable.
2017/10/02
Note that only the build process and introduction of the binary distributions has changed, no changes to code are reflected in this release.
ROM 4X
ROM 5X